[TechAssist] Re: Fw: CTC203 - loud fast chirping noise (long)
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 11 Jan 2005 08:40:28 -0500
Had one that was chirping like that and the flyback was bad.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Mark Goldspiel" <southdade@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, January 11, 2005 1:05 AM
Subject: [TechAssist] Re: Fw: CTC203 - loud fast chirping noise (long)
>
> -----Original Message-----
> From: Ronnie Alston <raalston@xxxxxxxxxxxx>
> Sent: Jul 20, 2004 10:16 AM
> To: "\"Tech Assist\"" <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Fw: CTC203 - loud fast chirping noise (long)
>
> Dan,
> This may not be your problem but I have found this before.
> No pic/snd chirps at plug in: q14104 leaky E-B, switching transistor
> for
> 12 v regulator ic u14104.
> Also, check q14105 and u14104, if bad they can cause the same problem.
> Q14105 is turned on by micro at turn on to turn 12v reg on. If 12v supply
> doesn't come on when set is innitially plugged into power source the micro
> won't even try to turn on the set.
> Hope this helps,
> Ronnie Alston
> Alston's TV Service
> 110 North Third Street
> Ozark, Ark, 72949
> raalston@xxxxxxxxxxxx
>
> ----- Original Message -----
> From: "Dan Garris" <dgarris@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, July 20, 2004 9:00 AM
> Subject: [TechAssist] CTC203 - loud fast chirping noise (long)
>
>
>> Sorry, I typed the wrong chassis # in the previous subject post. It is a
>> CTC203 CH3 Chassis.
>>
>>
>> Hi Fellow Techs, (tough dog so it's long)
>>
>> 32" RCA TV Model F32665
>> Chassis: CTC203CH3
>>
>> I have a Common CTC203CH3 32" RCA Chassis here with a loud super fast
>> chirping noise! (not a tick tick, squeal or a buzz, but a super fast
>> consistant repeative chirping noise as soon as you plug it in AC,
>> constant
>> continous hi-speed chirping like at a rate of 20 chirps a sec - werid to
>> describe but you get the idea - just not the normal tic tic or squeal)
> Fuse
>> ok, 2SC5148 Hot is OK, Flyback ok, voltage reg ok, Q14104 is good out of
>> circuit, no cracks in PCB, all solder is good, L14401 coil is good,
>> unplugged the Gemstar, what have I missed... Anyone seen this one?
>>
>> It's not the high pitched squeal you normally hear when the HOT is
> shorted.
>> (I double-checked the HOT out of circuit and it is Good!) I replaced the
>> flyback with new one and voltage regulator and checked all the common
> diodes
>> and the common L401 L101 coils (forget the exact part location #'s) even
>> took the two small coils out of circuit and double-checked them both and
>> both are good and have good connections. I've looked it over and
> troubleshot
>> it for 4 hours and looked thru all my Servicesoftware tips, ESD tips,
>> Intrepid tips (there are a lot for the CTC203) Dead - Loud fast chirping
>> noise. However let me describe the noise (super fast chirping) on this
>> set
>> because it is not the normal squeal I commonly hear with a shorted HOT.
>> It
>> is a chirping noise - Only very very fast(like 20chirps or more per
>> second
>> to help best describe) I wish I could play a .wav of it to all you fellow
>> techs but anyhow I am stumped and wanted to ask for any comments from
>> anyone. I am not charging customer for repair because it happens to be
>> someone in the family so wouldn't you know it, it would be the tough dog!
>> LOL
>>
>> Dan Garris
>> Garris TV
>> New Bern, NC 28560
>> dgarris@xxxxxxxxxxx
>> (252) 638-4477
>>
>>
>>
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